Add Box2DWeb-2.1.d.ts definitions

Created an extra sub-folder under box2d\ since there are multiple
definition files.
Merge branch 'master' of git://github.com/borisyankov/DefinitelyTyped
Changed box2d to only use a single file
Fixed Set/Get Sprite to CanvasContext2D on b2DebugDraw
Merge pull request #161 from jbaldwin/master

Box2d definitions
Update readme
Add iScroll and iScroll Lite definitions
Update knockout.mapping/knockout.mapping-2.0.d.ts

Adding Create Callback for KnockoutMappingOptions.
Merge pull request #164 from anwarjaved/patch-2

Update knockout.mapping/knockout.mapping-2.0.d.ts
Update knockout.mapping/knockout.mapping-2.0.d.ts

Add Update Callback.
Merge pull request #165 from anwarjaved/patch-3

Update knockout.mapping/knockout.mapping-2.0.d.ts
Update youtube definition.

Make the youtube definition more idiomatic TypeScript, and add some missing loadBy and cueBy methods.
Add SwipeView definitions
Add iScroll tests
Merge pull request #167 from ianobermiller/patch-1

Update youtube definition
Fix iScroll options definitions
jQuery TimePicker & WaterMark Definations
Merge remote-tracking branch 'upstream/master'
Merge pull request #168 from anwarjaved/master

Add jQuery TimePicker & WaterMark Definitions
Update jQuery.Watermark, add tests